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38-116 Code 125 Tube Heater Circuit Issue
#8

The rectifier tube is a 5Y4G.  If I continue with this set, I should get a 5X4G.  I measured -17 vdc on each 6L6 grid pin 5.  I also measured -17 vdc at the intersection of resistors 115 and 116.  I had to replace both of those and didn't have exact values for replacement so I used a 3300 ohm resistor for the 3000 (115) and a 2200 ohm resistor for the 2000 (116).  Also, both 6L6's tested on the borderline of acceptable (70% on my Jackson tester) and they both rattle.  I think the 5Y4 also tested weak.  I read that the 5Y4 is only for moderate dc requirements.  Maybe a weak one just won't hack it with this radio.


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RE: 38-116 Code 125 Tube Heater Circuit Issue - by LarryFS - 09-21-2019, 07:54 PM



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